Odiel, River system in Province of Huelva, Spain.
The Odiel is a river in the Province of Huelva that rises in the hills east of the Sierra de Aracena and flows south until it meets the Atlantic at Huelva. Just before reaching the sea, it joins the Tinto River to form a wide tidal estuary lined with salt marshes and tidal flats.
The estuary of the Odiel was an active trading point in ancient times, used by Phoenician merchants who navigated the southwestern Iberian coast. Later, mining activity in the inland hills sent large amounts of mineral-rich runoff into the river, leaving traces that are still visible in its reddish waters near the Tinto confluence.
The river mouth opens into a wide estuary near Huelva where small fishing boats still work the waters in ways that have changed little over time. The communities along the banks have long depended on what the river brings, from fish to migratory birds that draw visitors each year.
The river can be accessed from several towns around Huelva, and the estuary area includes protected zones where marked paths help orient visitors. Spring and autumn are the best seasons to visit if you want to see the largest number of water birds passing through or resting on the tidal flats.
The Odiel runs parallel to the Tinto for several miles before they merge, and where they meet, the difference in water color is visible to the naked eye. The Tinto carries so much mineral content from the mining areas upstream that the boundary between the two rivers can appear as a clear line across the water.
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